Security Policy with a query union linked to Role

Hi,

I created a union query on PurchTable to filter records. My query works fine but when I used it with a query Policy linked to a specific role, the purchTable form filters properly but loading is extremely slow before viewing records.

My query union is based on 2 datasources :

-1) Purchtable_1 with range  on field WorkerPurchPlacer

-2) PurchTable_2 linked to HcmWorker  (PurchTable2.Requester == HcmWorker.RecId) and a range on a new field on HcmWorker

An idea?